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单选题When the heat load begins to increase, the needle valve of an expansion valve will（）A move in an opening directionB move in a closing directionC either open or closeD not move at all

题目
单选题
When the heat load begins to increase, the needle valve of an expansion valve will（）
A

move in an opening direction

B

move in a closing direction

C

either open or close

D

not move at all

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相似问题和答案

第1题：

When the prime movers of two paralleled generators are equipped with mechanical-hydraulic governors, and are operating within their designed range, the unit with the least amount of speed droop will .

A.pick up more of any increase in load

B.pick up less of any increase in load

C.share an equal amount of any increase in load

D.drop an equal amount of any decrease in load


正确答案：A

第2题：

An increase in the heat load to a refrigeration system will cause ______.

A.the suction pressure to decrease

B.the suction temperature to increase

C.increased ice formation on the evaporator coil

D.excessive short cycling of the compressor


正确答案：B

第3题：

If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will .

A.have a larger than normal dead band

B.produce excessive speed response to a load change

C.respond slowly to any change in engine load

D.stabilize engine speed at the new governor setting


正确答案：B

第4题：

单选题
The needle valve in a fuel valve will （） when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.
A

be jammed

B

be opened

C

be seated

D

be broken


正确答案： A
解析： 暂无解析

第5题：

单选题
If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will （）
A

have a larger than normal dead band

B

produce excessive speed response to a load change

C

respond slowly to any change in engine load

D

stabilize engine speed at the new governor setting


正确答案： D
解析： 暂无解析

第6题：

The temperature of the refrigerant in the evaporator coil depends mostly upon the ___.

A.refrigerant pressure in the evaporator

B.cooling water temperature to the condenser

C.heat load in the refrigerator compartment

D.solenoid valve in the liquid line


正确答案：A

第7题：

When does language acquisition begin according to the research?

A.It begins with the birth of a baby.
B.It begins before the birth of a baby.
C.It begins when a baby starts imitating adults’ speech.
D.It begins with a baby's cry melodies typical of its mother tongue.

答案：B
解析：
细节题。根据倒数第二段中的“That acquisition，it is now clear, beginsmonths before birth，probably in the third trimester.”可知，婴儿在出生之前就开始了语言习得。故本题选B。

第8题：

When replacing a thermostatic expansion valve sensing bulb, it is necessary to

A.apply a light film of oil to increase heat transfer

B.apply a light film of oil to prevent oxidation

C.apply a heavy coating of grease to function as a heat sink

D.carefully coat the device with silicone sealant to reduce the effects of convective cooling


正确答案：D

第9题：

单选题
Adjustments to the compensating needle valve in a hydraulic governor should be made with the engine at （）
A

maximum power at a normal load

B

maximum power and load under normal conditions

C

half speed and normal temperature

D

normal operating temperature without a load


正确答案： A
解析： 暂无解析

第10题：

单选题
The period of valve overlap is when （）.
A

the inlet valve is open

B

the exhaust valve is open

C

both valves are close

D

both valves are open


正确答案： C
解析： 暂无解析

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